Apart from the fact that any browser can actually be used to do this job in a much more meaningful and elegant way, the free version is absolutely and utterly useless with fairly much all of the functionality of the premium version stripped out. A demo of the full plugin on the authors site reveals a completely unappealing and unaesthetic method of doing what anybody can do with a simple addon for firefox or IE.
If the author had been honest enough to allow try before buy rather than simply providing the bare minimum of a plugin to get people to download the advert for the premium version, I wouldn't feel as though I needed a bath right now, but as it stands the addon is ugly, unnecessary and the author seems to think getting you to install an advert is going to endear you to their money spinning idea